bimetal relay 40...57 A size S3 class 10 DO-3US5800-2T8K

Product Description

Siemens SIRIUS Bimetal Relay – 40…57 A, Size S3, Class 10 – 3US5800-2T8K

The Siemens 3US5800-2T8K is a SIRIUS thermal overload relay (bimetal type) designed for reliable protection of three-phase motors against overload, phase failure, and excessive temperature rise. It ensures safe motor operation by disconnecting the circuit when current exceeds the preset limit for a defined time.

This relay belongs to Size S3 and offers an adjustable current range of 40 to 57 A, making it suitable for higher power industrial motor applications. With a Class 10 tripping characteristic, it provides fast response during overload conditions, helping prevent motor winding damage and improving system reliability.

It is designed for direct mounting with Siemens SIRIUS contactors, making it ideal for motor starters, MCC panels, compressors, pumps, conveyors, and heavy-duty industrial automation systems.

Key Features:

• Siemens SIRIUS bimetal thermal overload relay 

• Adjustable current range: 40 – 57 A 

• Size S3 heavy-duty industrial design 

• Class 10 tripping characteristic (fast motor protection) 

• Phase failure protection for motor safety 

• Direct mounting with SIRIUS contactors 

• Manual/automatic reset option (variant dependent) 

• Screw terminal connection for secure wiring 

• Proven thermal bimetal sensing technology 

• Suitable for heavy industrial motor applications